通信系统中，信号捕获和同步的数字锁相环的MATLAB仿真程序-communications systems, signal acquisition and synchronization of digital PLL MATLAB simulation program

直接式数字锁相环频率合成器.用ELANIX公司SYSTEMVIEW运行.-direct digital PLL frequency synthesizer. SYSTEMVIEW ELANIX companies with operations.

数字锁相环，采用costas环的数字形式，实现跟踪载波相位，

。利用理想二阶锁相环构造了三阶 环，对其捕获带宽、时间响应特性、稳定性和误差响应特性进行了仿真研究，分析了三阶环的参数选择 原则和跟踪卫星多普勒频偏的能力，并给出了环路滤波器的数字实现框图-. Ideal second-order phase-locked loop constructed using the third-order loop, its capture bandwidth, time response, stability and response characteris